Detections
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Zyxel USG < 4.35 / ATP < 4.35 / VPN < 4.35 / ZyWALL < 4.35 (RCE) (CVE-2020-9054)

critical Nessus Plugin ID 176416

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Synopsis

The remote security gateway is affected by a remote code execution vulnerability.

Description

The Firmware version of the Zyxel USG, ATP, ZyWALL or VPN is affected by multiple vulnerabilities:

- A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device. (CVE-2023-33009)

 - A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.25 through 5.36 Patch 1, VPN series firmware versions 4.30 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.25 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device. (CVE-2023-33010)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Zyxel USG / ATP / VPN to version 4.36 Patch 1 or later or upgrade Zyxel ZyWALL to version 4.73 Patch 1 or later.

See Also

http://www.nessus.org/u?5a194b9d

Plugin Details

Severity: Critical

ID: 176416

File Name: zyxel_usg_CVE-2023-33010.nasl

Version: 1.4

Type: combined

Family: Firewalls

Published: 5/26/2023

Updated: 6/9/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2023-33010

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/h:zyxel:usg_flex

Required KB Items: Settings/ParanoidReport, installed_sw/Zyxel Unified Security Gateway (USG)

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/24/2023

Vulnerability Publication Date: 5/24/2023

CISA Known Exploited Vulnerability Due Dates: 6/26/2023

Reference Information

CVE: CVE-2023-33009, CVE-2023-33010

IAVA: 2023-A-0279